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1. 发明授权

US5303731A Liquid flow controller 失效
标题翻译：液体流量控制器
公开(公告)号：US5303731A
公开(公告)日：1994-04-19
申请号：US906922
申请日：1992-06-30
申请人： Randall J. Vavra , Michael J. Doyle , Kim N. Vu
发明人： Randall J. Vavra , Michael J. Doyle , Kim N. Vu
IPC分类号： G01F1/50 , G01F1/88 , G01F15/02 , G05D7/06
CPC分类号： G05D7/0635 , G01F1/50 , G01F1/88 , G01F15/022 , Y10T137/7737 , Y10T137/7759 , Y10T137/7761
摘要： A liquid flow controller for metering a flow of liquid has an inlet to receive the liquid. The inlet feeds the liquid to a high resistance liquid flow path across which a pressure drop arises. A pressure sensor measures the liquid flow induced pressure drop and generates pressure drop signal which is fed to an electronic circuit. A temperature sensor is connected to the high resistance liquid flow path and generates a temperature signal which is also fed to the electronic circuit. The circuit energizes a viscosity-normalized liquid flow signal, which is compared to a set point signal to generate an error signal. A valve connected downstream of the high resistance liquid flow path to control the flow of liquid is driven by the error signal and thereby controls the flow of liquid.
摘要翻译：用于计量液体流的液体流量控制器具有用于接收液体的入口。入口将液体供给到高阻力液体流动通道，压力下降产生。压力传感器测量液体流动感应压降并产生送入电子电路的压降信号。温度传感器连接到高电阻液体流路并产生也馈送到电子电路的温度信号。电路对粘度归一化的液体流量信号进行激励，该信号与设定点信号进行比较以产生误差信号。连接在高电阻液体流路下游以控制液体流动的阀门由误差信号驱动，从而控制液体流动。

2. 发明授权

US4913192A Gas flow control apparatus 失效
标题翻译：气体流量控制装置
公开(公告)号：US4913192A
公开(公告)日：1990-04-03
申请号：US332572
申请日：1989-04-03
申请人： Randall J. Vavra
发明人： Randall J. Vavra
IPC分类号： B01F3/02 , B01F5/04 , B01F15/02 , B01J4/00 , B08B9/02 , F17C9/02
CPC分类号： B08B9/0321 , B01F3/022 , B01F5/0413 , B01F5/0428 , B01F5/043 , B01J4/008 , F17C9/02 , B01F15/0201 , F17C2205/0385 , F17C2223/0153 , F17C2225/0123 , F17C2227/0114 , F17C2227/0393 , F17C2250/0636 , F17C2270/0518 , Y10T137/87595 , Y10T137/87627 , Y10T137/87643
摘要： Gas flow control apparatus for controlling the flow of a process gas through a conduit system to a process site, for halting the flow of gas when the process is completed, and for then developing a partial vacuum in the conduit system sufficiently high to reduce the concentration of process gas and maintain it in a gaseous state. The partial vacuum is developed by carrier gas flowing through a venturi in communication with the conduit system supplying the process gas. The carrier gas also expels any remnants of the process gas from all points between the venturi and the process site. Further, the system can be used for vaporizing gases from liquids for use in an atmospheric process at the process site, the carrier gas flowing through the venturi and vaporizing a liquid in a chamber upstream of the venturi. The vaporized gases can then be regulated by a mass flow controller.
摘要翻译：气体流量控制装置，用于控制处理气体通过管道系统流到处理现场，用于在处理完成时停止气体流动，然后在管道系统中显着增加足够高的浓度以减少浓度的工艺气体并将其保持在气态。部分真空是通过与供给工艺气体的管道系统连通的文丘里管的载气显影的。载气也从文丘里管和过程现场之间的所有点排出工艺气体的任何残留物。此外，该系统可用于将气体从液体中蒸发，用于在处理现场的大气过程中，载气流过文丘里管并蒸发文丘里管上游的腔室中的液体。蒸发的气体可以由质量流量控制器调节。

3. 发明授权

US4858643A Fluid flow stabilizing apparatus 失效
标题翻译：流体流动稳定装置
公开(公告)号：US4858643A
公开(公告)日：1989-08-22
申请号：US167572
申请日：1988-03-14
申请人： Randall J. Vavra , Michael Doyle
发明人： Randall J. Vavra , Michael Doyle
IPC分类号： F15D1/02 , F15D1/00 , F16L55/027 , G01F1/48
CPC分类号： F15D1/0005 , F16L55/02763 , Y10T137/7759 , Y10T137/7761
摘要： A fluid flow stabilizer which includes two pluralities of stabilizer units adjacent one another. Each unit includes a plurality of parallel axially extending tubules. The units are movable into different relative positions so that certain of the tubules of a unit are aligned in fluid communication with tubules of another unit. Index means are provided for fixing the units in different selected relative positions.

4. 发明授权

US5279154A Thermal mass flow sensor 失效
标题翻译：热质量流量传感器
公开(公告)号：US5279154A
公开(公告)日：1994-01-18
申请号：US947889
申请日：1992-09-18
申请人： Randall J. Vavra , Lam T. Nguyen , Erik Q. Tran
发明人： Randall J. Vavra , Lam T. Nguyen , Erik Q. Tran
IPC分类号： G01F1/684 , G01F1/696 , G01F5/00 , G01F1/68
CPC分类号： G01F1/6847 , G01F1/696 , G01F5/00
摘要： A vertical flow thermal mass flow sensor for a vertical flow thermal mass flow meter of a vertical flow thermal mass flow controller has a sensor tube having a gas inlet for receiving a gas to be metered. The sensor tube includes a first curved convection trap and a second curved convection trap for preventing convective flow of the gas through the sensor tube. A thermally responsive winding is wound about the sensor tube and is energized from a source of electrical energy. The resistance of the thermally responsive winding is responsive to the rate of flow of the gas through the sensor tube and provides an indication thereof.
摘要翻译：用于垂直流热质量流量控制器的垂直流热质量流量计的垂直流量热质量流量传感器具有传感器管，其具有用于接收要计量的气体的气体入口。传感器管包括第一弯曲对流阱和第二弯曲对流阱，用于防止气体通过传感器管的对流。热响应绕组缠绕在传感器管周围，并从电能源通电。热响应绕组的电阻响应于通过传感器管的气体的流速，并提供其指示。

5. 发明授权

US4686856A Mass flow meter 失效
标题翻译：质量流量计
公开(公告)号：US4686856A
公开(公告)日：1987-08-18
申请号：US851262
申请日：1986-04-09
申请人： Randall J. Vavra , Michael J. Doyle
发明人： Randall J. Vavra , Michael J. Doyle
IPC分类号： G01F1/684 , G01F1/68
CPC分类号： G01F1/6847
摘要： A fluid mass flow meter that responds rapidly to changes in the rate of flow of a fluid and that is insensitive to variations in ambient temperature. The flow meter has a thermal clamp that clamps the sensor tube adjacent the extremities of a sensor disposed along the tube; a frequency compensating amplifier that, in cooperation with the thermal clamp, increases the frequency response of the meter; and an offset null bias circuit that, in combination with a bridge balancing potentiometer, corrects for the effects of variations in ambient temperature.
摘要翻译：流体质量流量计，其对流体的流速变化作出快速响应，并且对环境温度变化不敏感。流量计有一个热夹，夹紧传感器管，靠近沿着管放置的传感器的末端; 与热钳相配合的频率补偿放大器增加了仪表的频率响应; 以及与桥接平衡电位器组合的偏移零偏置电路，用于校正环境温度变化的影响。

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